A robbery attempt at a convenience store in Middletown ended with the suspect dead after suffering a medical emergency while trying to flee, according to authorities.

City of Middletown police say the incident happened shortly before 8 p.m. on Wednesday at Ezzie's Corner convenience store in the area of 130 Wickham Ave.

Authorities say a 61-year-old man entered the store and demanded money from the female clerk, threatening to shoot her if she did not comply.

The 57-year-old female clerk handed over cash from the register, but then chased the suspect out of the store and down the street in an attempt to retrieve the money, according to authorities.

Police say the clerk caught up to the suspect outside and the two fell to the ground in a driveway near 117 Wickham Ave., where she held him down while yelling for help.

A witness who saw the incident called police.

When officers arrived, police say the suspect was unconscious and not responsive. Officers began life-saving measures, including CPR. The man was taken to Garnet Health Medical Center, where officials say he later died.

The district attorney says the suspect had a history of heart issues, but his exact cause of death remains under investigation. He says the clerk was within her rights to try to retrieve the money but that it's unclear if she'll face any charges.

The investigation remains ongoing. The suspect's identity has not been released pending notification of next of kin.